Bulk superconductivity in Pb-substituted BiS2 -based compounds studied by hard x-ray spectroscopy

A. Yamasaki, T. Oguni, T. Hayashida, K. Miyazaki, N. Tanaka, K. Nakagawa, K. Tamura, K. Mimura, N. Kawamura, H. Fujiwara, G. Nozue, A. Ose, Y. Kanai-Nakata, A. Higashiya, S. Hamamoto, K. Tamasaku, M. Yabashi, T. Ishikawa, S. Imada, A. SekiyamaH. Sakata, S. Demura

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1 Citation (Scopus)


In this study, we investigate the bulk electronic structure of Pb-substituted LaO0.5F0.5BiS2 single crystals, using two types of hard x-ray spectroscopy. High-energy-resolution fluorescence-detected x-ray absorption spectroscopy revealed a spectral change at low temperatures. Using density functional theory (DFT) simulations, we find that the temperature-induced change originates from a structural phase transition, similar to the pressure-induced transition in LaO0.5F0.5BiS2. This finding suggests that the mechanism of bulk superconductivity induced by Pb substitution is the same as that under high pressure. Furthermore, a low-valence state with a mixture of divalent and trivalent Bi ions is discovered using hard x-ray photoemission spectroscopy with the aid of DFT calculations.

Original languageEnglish
Article number045131
JournalPhysical Review B
Issue number4
Publication statusPublished - 15 Jan 2024


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